Kuhn argue scientists have paradigms and new paradigms work better and replace old ones i. e. einstein"s theory of relativity. After a paradigm shift, enter a period of normal science. Then get more data that new model cannot handle so a newer model is created. Very dramatic shift in what everybody believes. What questions should we ask, what terms should we use, how do we analyze, etc. Based on computer programs and computer architecture. Architecture: computers have an input system (keyboard), a central processor to do the computing and the output system (screen) Program: humans have input systems (senses), central processor (mind), output system (commands to muscles) Information stored in computer in symbolic form (binary code, 1, 0); human minds must have something similar. Pylyshyn (psychologist): symbol has a physical form and also has a meaning, thus, symbols solve the mind-body problem; not really. Figure out architecture and program running the human mind.